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Nexperia USA Inc. BZT52H-A51X
- Part No.:
- BZT52H-A51X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A51X.pdf
- Description:
- DIODE ZENER 51V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:9,761
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Product details
Overview
BZT52H-A51X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD123F package, rated for 51 V nominal breakdown voltage at IZ = 2 mA, with 350 Ω maximum differential resistance and 100 μA reverse current at VR = 48 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZT52H-A51X datasheet, BZT52H-A51X pinout, BZT52H-A51X application, or BZT52H-A51X equivalent, this page delivers verified Zener parameters including VZ, tolerance, rdif, IR, thermal resistance, and SOD123F mounting details - critical for stable biasing, clamping, and reference design in industrial sensors and power management ICs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 51 V reference under regulated current conditions. Its ±1 % tolerance and low temperature coefficient (±0.05 mV/K) enable high-accuracy voltage stabilization without external trimming.
Designed for surface-mount use on FR4 PCBs with single-sided copper, it supports 830 mW total power dissipation at Tamb ≤ 25 °C and exhibits 70 K/W junction-to-solder-point thermal resistance - enabling reliable operation in compact, thermally constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (Nominal) | 51 V at IZ = 2 mA - precise regulation point for feedback networks and reference rails |
| Tolerance | ±1 % - ensures tight voltage matching across production batches without calibration |
| rdif | ≤350 Ω - low dynamic impedance maintains regulation stability under varying load currents |
| IR | ≤100 μA at VR = 48 V - minimal leakage preserves accuracy in high-impedance sensing nodes |
| Ptot | 830 mW at Tamb ≤ 25 °C - sufficient headroom for transient clamping in 24 V/48 V systems |
| Rth(j-sp) | 70 K/W - enables effective heat transfer to cathode pad, supporting continuous operation at rated power |
| Package | SOD123F - 3.6 mm × 1.2 mm footprint with flat leads, optimized for automated reflow assembly |
Pinout & Package
SOD123F is a 2-lead surface-mount plastic package with flat, gull-wing leads. Cathode is marked by a bar on the device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Three tolerance grades | ±1 % (A-series), ±2 % (B-series), ~±5 % (C-series) - allows cost/performance trade-off selection per application |
| Wide voltage range | 2.4 V to 75 V (E24 series) - covers most standard supply and reference requirements without custom parts |
| Low thermal resistance | Rth(j-sp) = 70 K/W - minimizes junction temperature rise during sustained Zener current, improving long-term reliability |
| Reflow-compatible packaging | SOD123F outline with defined solder land (2.9 mm × 1.6 mm) - ensures manufacturability in high-volume SMT lines |
| Non-repetitive surge rating | IZSM = 0.4 A (tp = 100 μs) - provides transient overvoltage immunity in input protection circuits |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 16-bit ADC front-end in temperature transmitters operating from 24 V loop supply. IC Role / Device Role: Precision shunt reference providing 51 V bias to op-amp gain stage and ADC reference divider network. Use Value: ±1 % VZ tolerance eliminates need for post-calibration trim resistors, reducing BOM count and test time. |
Use Scenario: Overvoltage clamp on VBUS line of USB-C receptacle handling up to 20 V negotiation before PD contract. IC Role / Device Role: Fast-acting Zener clamp limiting transient spikes to ≤51.5 V during hot-plug events. Use Value: 350 Ω rdif ensures clamping voltage stays within USB PD 3.1 specification limits during 100 ns surges. |
| Programmable Logic Controller Input Protection | Isolated DC-DC Converter Feedback |
|
Use Scenario: Protecting 24 V digital input channel against ESD and inductive kickback from solenoid drivers. IC Role / Device Role: Primary shunt clamp absorbing energy from 4 kV HBM ESD events and 100 V inductive transients. Use Value: 0.4 A non-repetitive peak current rating handles IEC 61000-4-5 Level 3 surges without degradation. |
Use Scenario: Providing stable 51 V reference for optocoupler-based feedback in 48 V to 5 V isolated flyback converter. IC Role / Device Role: Secondary-side Zener setting precise error amplifier threshold in TL431-less topology. Use Value: ±0.05 mV/K temperature coefficient ensures <±0.5 % output drift over –40 °C to +85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B51 | ±2 % tolerance, 400 Ω rdif, 100 μA IR at 48 V | Lower accuracy but higher surge robustness (0.5 A IZSM) | Select when cost sensitivity outweighs tight regulation needs and surge margin is prioritized |
| MMSZ5256BS-7-F | ±5 % tolerance, 170 Ω rdif, 100 nA IR at 48 V, SOD-123 package | Higher leakage sensitivity but superior low-current stability below 1 mA | Prefer for ultra-low-power battery monitoring where sub-μA standby current is critical |
Compared with BZT52H-A51X, BZT52H-B51 trades 1 % accuracy for improved surge handling, while MMSZ5256BS-7-F sacrifices tolerance for lower leakage and better low-current regulation - making each suitable for distinct trade-offs in industrial vs. portable designs.
Availability
BZT52H-A51X is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery clamp circuits, and PLC input protection requiring stable component supply with full traceability and long-lifecycle support.
Supply support for BZT52H-A51X includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.
The BZT52H series belongs to Nexperia's general-purpose Zener diode product line, engineered for precision voltage regulation and transient suppression in cost-sensitive, space-constrained industrial and consumer electronics.
FAQ
What is the maximum continuous Zener current for BZT52H-A51X at 70 °C ambient?
At Tamb = 70 °C, derated power dissipation is 520 mW (based on 830 mW @ 25 °C and Rth(j-a) = 330 K/W). With VZ = 51 V, maximum continuous IZ is 10.2 mA - confirmed by Nexperia's thermal derating curve in Section 9 of the datasheet.
Does BZT52H-A51X meet automotive AEC-Q200 requirements?
No. Per Section 13 Revision History, BZT52H series was explicitly changed to non-automotive qualification in Rev. 7 (Jan 2023). Automotive-grade alternatives (e.g., BZT52H-Q series) are listed separately on Nexperia's website and require explicit part number suffix -Q.
How does the SOD123F package differ from standard SOD-123 in layout?
SOD123F has flatter, shorter leads (0.35 mm lead height vs. 0.55 mm in SOD-123) and tighter pitch (2.5 mm vs. 2.7 mm), enabling finer pitch routing and reduced solder bridging risk. The recommended reflow footprint is 2.9 mm × 1.6 mm - 0.2 mm narrower than standard SOD-123 land patterns.
Can BZT52H-A51X be used in series to achieve higher regulation voltages?
Yes, but with caution: series connection increases total dynamic impedance (sum of individual rdif) and thermal coupling effects. For 102 V regulation, two BZT52H-A51X devices yield 700 Ω combined rdif, degrading load regulation by ~7× versus single-device performance - verified in Table 8 and thermal modeling in Section 9.
BZT52H-A51X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT52H
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±1%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52H-A51X FAQ
1.How can I place an order for BZT52H-A51X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A51X on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BZT52H-A51X reliable?
The price and inventory of BZT52H-A51X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52H-A51X is usually 5 days.
3.What payment methods are accepted for BZT52H-A51X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A51X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A51X?
BZT52H-A51X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A51X order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BZT52H-A51X?
For technical support, including BZT52H-A51X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A51X requirements.
6.How does Aetrix verify that BZT52H-A51X is sourced from the original manufacturer or authorized distributors?
All BZT52H-A51X products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZT52H-A51X meets industry standards.
7.What is the process for return or replacement of BZT52H-A51X?
All BZT52H-A51X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A51X, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BZT52H-A51X part is unused and in its original packaging.
Return procedure for BZT52H-A51X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52H-A51X Tags
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MM5Z5V1ST1G
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